Towards Continuous Flow, Highly Enantioselective Allylic Amination: Ligand Design, Optimization and Supporting
作者:Dana Popa、Rocío Marcos、Sonia Sayalero、Anton Vidal-Ferran、Miquel A. Pericàs
DOI:10.1002/adsc.200900163
日期:2009.7
(‐CH2OR) has been optimized for the palladium‐catalyzed asymmetric allylic amination. The optimal catalyst (R=CH3), depicting very high catalytic activity and broad scope applicability, has been further modified to include an ω‐alkynyloxy substituent of variable length for polymer supporting via click chemistry, and has been anchored onto slightly cross‐linked azidomethyl poly(styrene). The length of a polymethylene
对映体纯的二苯基膦基恶唑啉(PHOX)系列在其结构中包含一个空间可调的烷氧基甲基(-CH 2 OR),已针对钯催化的不对称烯丙基胺化进行了优化。表现出非常高的催化活性和广泛的适用性的最佳催化剂(R = CH 3)已被进一步修饰,以包括可变长度的ω-炔氧基取代基,以通过点击化学支持聚合物,并已锚定在稍微交联的叠氮基甲基聚(苯乙烯)上。已优化了连接PHOX单元与1,2,3-三唑连接基的多亚甲基链的长度,并以此方式制备了第一个聚合物支撑的高对映选择性烯丙基胺化的PHOX配体。已经建立了在微波促进的胺化反应中催化剂回收和再利用的条件,并且该系统最终适用于连续流操作。